Tax is the usual one. That list also includes a lot of closed or dormant subsidiaries. Perhaps it's best to think of them as being like AWS VMs that get provisioned and de-provisioned, some with short lives. Tesco is complicated by takeovers that haven't been fully incorporated; I see a lot of familiar brand names in that list, and a whole other pile of fragments of Booker (giant wholesalers recently taken over)

I tried https://beta.companieshouse.gov.uk/company/07530494/filing-h... based on "EBT" in the name (tax shelter scheme), but it's a dormant empty shell.

TESCO GREY (2LP) LIMITED https://beta.companieshouse.gov.uk/company/FC027196 registered in the Cayman Islands? Obvious tax shelter of some sort. Also closed.